Item 5 (000Z) — The Clowder Project

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Style	Class	Font	Theorem Environments
Style 1	`book`	Alegreya Sans	`tcbthm`
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Style 3	`book`	Arno*	`amsthm`
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*To be replaced with Linus Romer's Elemaints when it is released.

Commutativity. We have an isomorphism of sets
\[ \sigma ^{\mathsf{Sets}}_{A,B}\colon A\times B \overset {\scriptstyle \mathord {\sim }}{\dashrightarrow }B\times A, \]

natural in $A,B\in \text{Obj}\webleft (\mathsf{Sets}\webright )$.

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